Abstract: While constructing “the fourth medium” as new home of arts,artists of the Internet art has come in sight of its various irregularities caused by commercialization and other reasons.Therefore,they have built up links with the independent medium,tactics medium,and pure personal medium.This kind of contacts is the important form of media criticism in the nettme.In practice,they has revealed the commercial essence of search engine service,getting rid of the world-wide-web mirage created by the commercial browsers,and attacked the negative things existing in Internet like junk mails and so on.This kind of revealing and criticizing depend on techniques controlled,applied or invented by them,and play positive roles in purifying current media and conceiving new media.

Key words: Internet, art, new media